A futuristic American scientist has predicted that man could become immortal in as little as 20 years' time through nanotechnology and better understanding of the body mechanism.

Ray Kurzweil, known to have predicted future technologies decades ahead has written in The Sun, 'I and many other scientists now believe that in around 20 years we will have the means to re-programme our bodies' stone-age software so we can halt, then reverse, ageing. Then nano-technology will let us live for ever.'

The 61-year-old, lauded by Microsoft [ Images ] founder Bill Gates [ Images ] as the smartest futurist on Earth said," We are living through the most exciting period of human history.

The scientist says that already, blood cell-sized submarines called nanobots are being tested in animals. These will soon be used to destroy tumours, unblock clots and perform operations without scars.

Ultimately, nanobots will replace blood cells and do their work thousands of times more effectively, he added.

According to his theory called the Law of Accelerating Returns mankind will experience a billion-fold increase in technological capability for the same cost in the next 25 years.

Nanotechnology will help in making humans achieve immortality said Kurzweil, 'By the middle of the next century we will have back-up copies of the information in our bodies and brains that make us who we are. Then we really will be immortal.'

'Nanotechnology will extend our mental capacities to such an extent we will be able to write books within minutes. If we want to go into virtual-reality mode, nanobots will shut down brain signals and take us wherever we want to go. Virtual sex will become commonplace. And in our daily lives, hologram like figures will pop in our brain to explain what is happening,' he said.

The scientist also predicts that humans in future will become cyborgs, with artificial limbs and organs.

1. Every body becomes immortal. But they will not be selfrealized. So, the earth will become full and overflowing withduds.

2. Perhaps, they may stop future births too. Then the earth will be full of old people, a 70 year old Subramanian, a 90 year oldMr.X and a 120 year old Mr. Y.

3. If everybody is immortal, how can Kalki (the 10th avatara ofVishnu can come down, to kill people? So Puranas will becomea falsity. Kalki cannot come down on earth.

4. In homes, all old couples will be watching, TV serials ad nauseum. In T.V serials too, there will be 100 year old herosinging duet song with a 90 year old herione. Even if theyuse special advanced make-ups, there age is quite known toaudience.

5. Since everyone is immortal, no one can kill others. So,some great Tsunami or earth quake, or a number of Icelandicvolcanoes have to erupt, to clear up the mess. Or super humansfrom Mars should invade the earth and burn the earth totally!

When the scientist can create even God, why he cannot create unconditional heart and implant in human being so the whole world become heaven? whatever he creates it would have mind within which may create lots of problem.